Biology 322 human anatomy i
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Biology 322 Human Anatomy I. Autonomic Nervous System. Autonomic Nervous System. The efferent (motor) component of the peripheral nervous system includes two types of neurons: Neurons Neurons. Comparison: Somatic vs Autonomic efferent neurons.

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Biology 322 Human Anatomy I

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Biology 322Human Anatomy I

Autonomic Nervous System


Autonomic Nervous System


The efferent (motor) component of the peripheral nervous system includes two types of neurons:

Neurons

Neurons


Comparison: Somatic vs Autonomic efferent neurons

Somatic

Autonomic

Voluntary Involuntary

Effectors: Skeletal M. Effectors: Cardiac M.

Smooth M

Glands

Neurons extend from CNS to effectors without synapsing.

Two neurons to get from CNS to effectors;

Therefore one synapse.

"Two neuron chain"


Autonomic Nervous System

Two divisions based on:

a)

b)


Division of Autonomic Nervous System

Preganglionic neuron starts

Preganglionic neuron synapses

Division of Autonomic Nervous System

Preganglionic neuron starts

Preganglionic neuron synapses


Sympathetic Division

Synapse between preganglionic neuron and postganglionic neuron can occur in either of two sets of ganglia

1)

  • .


Sympathetic Ganglia


Sympathetic Ganglia


Parasympathetic Division

Synapse between preganglionic and postganglionic neurons occurs in ganglia very close to the target cells:

1.


Parasympathetic Division

Synapse between preganglionic and postganglionic neurons occurs in ganglia very close to the target cells:

2.


Parasympathetic Division

Synapse between preganglionic and postganglionic neurons occurs in ganglia very close to the target cells:

2.


Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.

Sympathetic:

Parasympathetic:


Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.

For example:

Heart:

Sympathetic increases heart rate & force of contraction

Parasympathetic decreases heart rate & force of contraction


Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.

For example:

(Heart: Sympathetic increases rate & force

Parasympathetic decreases rate & force )

Lungs:

Sympathetic dilates air passages

Parasynpathetic constricts air passages


Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.

For example:

(Heart: Sympathetic increases rate & force

Parasympathetic decreases rate & force )

(Lungs: Sympathetic dilates air passages

Parasynpathetic constricts air passages)

Digestive System:

Sympathetic decreases activity; constricts anal sphincter

Parasympathetic increases activity; relaxes anal sphincter


Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.

For example:

(Heart: Sympathetic increases rate & force

Parasympathetic decreases rate & force )

(Lungs: Sympathetic dilates air passages

Parasynpathetic constricts air passages)

(Digestive System: Sympathetic decreases activity

Parasympathetic increases activity)

Urinary System:

Sympathetic inhibits urination

Parasympathetic promotes urination


Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.

For example:

(Heart: Sympathetic increases rate & force

Parasympathetic decreases rate & force )

(Lungs: Sympathetic dilates air passages

Parasynpathetic constricts air passages)

(Digestive System: Sympathetic decreases activity

Parasympathetic increases activity)

(Urinary System: Sympathetic inhibits urination

Parasympathetic promotes urination)


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